Is there way to check each data type of Shopify data?

I was wondering is there any way to see the data type of each data and also there is any max length of ids. 

I can check Shopify's data structure by reading their API documents but even though they do not define the data type of each column, should I assume it by the API documents like SKU is a string...? Is there any official document that explains each data type or max length of the data on Shopify?